I also use a two bath technique. Kodak Rapid Fix with no hardener. I believe if you use an acid stop bath before fixing the first fixer will become quite acid by the end of your session. I follow fixing with Rapid Selenium Toner with some hypo clear and the hypo clear before washing. I've used this for over thirty years with no apparent change in the prints having used a variety of FB papers. I say if the prints are important to be made, go with archival process.